For making fast sprayed rubber molds that have the best release properties for production casting of resins, plaster, etc. it is a tin silicone rubber that self-thickens for making concrete Spray able -on molds . Properly applied, Mixed 100A:10B by weight, rubber quickly develops thixotropy when mixed in air. Cured with negligible shrinkage to a durable mold rubber good for production casting resins, foams,concrete, plaster and other materials. Application of a support shell is achieved by spraying over the rubber mold after it has fully cured. for any details information please contact  shgslsl at 21cn dot com, skype:happy7415 ,Tel:0086-755-27052112 Fax:0086-755-27052562 ,MSN:happy741@live.cn